so for example, in the case of sandy, which was not an especially big hurricane, the economic impact was $30 billion and that's in the developed world where we have the resources to deal with it. when you have people displaced on a continental scale, we're not talking about a few people trying to get through a fence at a border between countries. we're talking about tens of millions of people trying to move north, trying to move out of southeast asia. you're going to have trouble. so the sooner we get started on that problem, the better. >> these predictions are based on climate models -- >> i appreciate your yelling. that's good. >> mark, do you accept that the ocean levels are rising, that the planet is getting hotter, that co2 emissions have dramatically increased in the last 50 years, and ice sheets are shrinking and the planet population is doubling and accelerating at a terrifying rate, and that the combination of all these things is likely to be a major problem for the next two or three generations, and therefore, doing nothing shouldn't really be a sensible responsible option